People (and bots) who think HN is the place to “promote their products” don't understand HN (though, as you note, that belief is is widespread and is having an acute effect on our inbox!)

Show HN is for showing a cool project you've built. To warrant front page placement, it has to “gratify intellectual curiosity”, just like everything else. There needs to be some kind of novel breakthrough or something for others to learn from. Or, sure, some way it can help others with their work or life.

And yes, a byproduct of all this may be that some people buy a license or subscription. But submitters who are just trying to get attention and sales for a commercial product don't belong in Show HN.